|
Name |
Image |
Date |
Location |
County |
Ownership |
Description |
---|
1 |
Boulder Park and McNeil Canyon Haystack Rocks |
 |
01986 1986 |
|
Douglas |
mixed- federal, state |
The most illustrative examples of glacial erratics in the United States. |
2 |
Davis Canyon |
|
01986 1986 |
|
Okanogan |
mixed- state, private |
One of the largest and least disturbed examples of antelope bitterbrush-Idaho fescue shrub steppe remaining in the Columbia Plateau. |
3 |
Drumheller Channels |
 |
01986 1986 |
|
Adams, Grant |
mixed- federal, state, private |
Illustrates the dramatic modification of the Columbia Plateau volcanic terrain by late Pleistocene catastrophic glacial outburst floods. Includes Columbia National Wildlife Refuge. |
4 |
Ginkgo Petrified Forest |
 |
01965 1965 |
|
Kittitas |
state |
Thousands of logs petrified in lava flows. Part of Ginkgo/Wanapum State Park. |
5 |
Grand Coulee |
 |
01965 1965 |
|
Grant |
mixed- federal, state, private |
An illustration of a series of geological events. |
6 |
Grande Ronde Feeder Dikes |
|
01980 1980 |
|
Asotin |
private |
The best example of basalt dikes, the congealed feeder sources of the Columbia River basalt plateau. |
7 |
Grande Ronde Goosenecks |
|
01980 1980 |
|
Asotin |
federal |
A 1,500-foot (460 m) deep canyon that follows a tortuous path along meanders. |
8 |
The Great Gravel Bar of Moses Coulee |
|
01986 1986 |
|
Douglas |
mixed- state, private |
Largest and best example of a pendent river bar formed by catastrophic glacial outburst floods that swept across the Columbia Plateau. |
9 |
Kahlotus Ridgetop |
|
02011 2011 |
|
Franklin |
state |
The best remaining example of the Central Palouse Prairie grassland subtheme. |
10 |
Mima Mounds |
 |
01966 1966 |
|
Thurston |
state |
A prairie containing unusual soil pimples of black silt-gravel. |
11 |
Nisqually Delta |
|
01971 1971 |
|
Pierce, Thurston |
mixed- federal, state, tribal, private |
An unusually fine example of an estuarine ecosystem. INcludes Nisqually National Wildlife Refuge. |
12 |
Point of Arches |
|
01980 1980 |
|
Clallam |
federal |
An outstanding exhibit of sea action in sculpturing a rocky shoreline. A unit of Olympic National Park. |
13 |
Rose Creek Preserve |
|
01984 1984 |
|
Whitman |
private |
The best remaining example of the aspen phase of the hawthorne-cow parsnip habitat type in the Columbia Plateau. Managed by The Nature Conservancy. |
14 |
Sims Corner Eskers and Kames |
 |
01986 1986 |
|
Douglas |
mixed- federal, state, private |
The best examples in the Columbia Plateau of landforms resulting from stagnation and rapid retreat of the ice sheet during the last glaciation. |
15 |
Steptoe and Kamiak Buttes |
 |
01965 1965 |
|
Whitman |
mixed- state, county, private |
Isolated mountain peaks of older rock surrounded by basalt, rising above the surrounding lava plateau. |
16 |
Umtanum Ridge Water Gap |
 |
01980 1980 |
|
Kittitas |
mixed- federal, state, private |
Illustrates the geological processes of tectonic folding and antecedent stream cutting. |
17 |
Wallula Gap |
 |
01980 1980 |
|
Benton, Walla Walla |
mixed- state, federal, county, municipal |
The largest and most spectacular of several large water gaps through basalt anticlines in the Columbia River basin. |
18 |
Withrow Moraine and Jameson Lake Drumlin Field |
 |
01980 1980 |
|
Douglas |
mixed- federal, private |
The best examples of drumlins and the most illustrative segment of the only Pleistocene terminal moraine in the Columbia Plateau |